4 papers
Ward Identity Constraints on Loop Corrections in Non-Attractor Inflation
Cheng-Jun Fang, Zhen-Hong Lyu, Chao Chen +1
The conservation of super-horizon curvature perturbations in strongly interacting inflationary models, particularly in the presence of quantum-loop corrections, remains a topic of…
Toller matrices and the Feynman in spinfoams
Eugenio Bianchi, Chaosong Chen, Mauricio Gamonal
We study the analytic properties and three equivalent representations of the Toller matrices which appear in the causal formulation of spinfoam transition amplitudes fo…
Causal spinfoam vertex for 4d Lorentzian quantum gravity
Eugenio Bianchi, Chaosong Chen, Mauricio Gamonal
We introduce a new causal spinfoam vertex for d Lorentzian quantum gravity. The causal data are encoded in Toller -matrices, which add to Wigner -matrices $T^{(+)}+T^{(-)}…
Incorporating Backreaction in One-Loop Corrections in Ultra-Slow-Roll Inflation
Cheng-Jun Fang, Zhen-Hong Lyu, Chao Chen +1
We investigate the one-loop quantum correction to the power spectrum of primordial curvature perturbations in the ultra-slow-roll (USR) inflationary scenario, incorporating the bac…